TX200 HC power reduction?

[Sake-san]

Looking into it with a torch should tell you, a generous squirt of degreaser will help to loosen the grip of old compacted grease etc.

[Bosun]

Bosun,

You have checked that there are no 'spacing washers' at the base of the piston...? They are sometimes there, but are difficult to get out. Invert the piston and give a few sharp bangs of the latch rod end onto a piece of wood, so's not to damage the latch rod. It is very unusual for a standard spring to be producing 11.8 ft.lbs.

Finners.

Many thanks. I'll take a look there first. On previous AA springers, the pre-load washers have always been on the spring guide rod.

[Bosun]

Mmmm....... No washers in the piston, so I think I'll give "collapsing a coil" a try. I watched the videos and it seems pretty straightforward. However, there was no mention of re-tempering. OK, the collapsed coils will be fine, but what about the adjacent live coils?

[neil180]

Dont worry about re tempering. Just heat up the end coil that you want to collapse. Collapse it and let it cool down in air. Job done.

[Sake-san]

Just to add, you probably know anyway but, do it at the front (muzzle) end of the spring, less stress there.

[Bosun]

Just to add, you probably know anyway but, do it at the front (muzzle) end of the spring, less stress there.

Thanks for that. No I didn't know. But why should there be less stress at one end than the other?

[Sake-san]

I know not the technicalities but, it was advice passed to me by two of the UK's pre-eminent tuners
Gary Martin understands engineering stuff, perhaps he will have an answer?

[gary martin]

springs tend to fail at the rearmost coils. greater stress at this end. when trigger is released, the coils at the piston end open/destress first, then the coils behind start the process. the rear of the spring is forced toward rear guide, opposite/ reaction to the piston being forced forward. piston also trying to move forward whilst hitting compressed air, sending forces rearward, rear of spring gets a harder time due the the lag in coils opening whilst forces coming back up the spring when they are trying to destress/open.